<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>集合</title>
</head>
<body>
    <script>
        let set = new Set(["大事","小事","坏事","没事","没事儿"]);
        console.log(set);
        //add
        //delete
        set.delete()
        //has 含有
        set.has();
        
    </script>
</body>
</html>